Headphone



FIG. 1 is a front perspective view of the subject design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is right side perspective view thereof;

FIG. 4 is a left side rear perspective view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown on the drawings are included for the purpose of illustration and form no part of the claimed design. 

CLAIM The ornamental design for headphone, as shown and described. 